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A 154 day periodicity in the occurrence rate of proton flares
Bai, Taeil; Cliver, E. W.
AA(Stanford University, CA), AB(USAF, Geophysics Laboratory, Hanscom AFB, MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 1, 1990, p. 299-309. Previously announced in STAR as N90-23333. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Periodic Variations, Solar Activity, Solar Cycles, Solar Flares, Solar Protons, Fast Fourier Transformations, Power Spectra
Bibliographic Code:


We have analyzed periodicities in the occurrence rate of proton flares for solar cycles 19 through 21 (1955 to 1986) and have identified two epochs that exhibit a 154-day periodicity. These epochs are a 14-year interval from 1958 January through 1971 December and a 5.5-year interval from 1978 February to 1983 August. The best-determined period is 154.6. We have found that the phase of this periodicity changed between the above-mentioned two epochs by about one half of a period. It appears that the occurrence rate of proton flares is more sensitive to the 154-day periodicity than the occurrence rate of flares selected by other criteria.

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